[c-nsp] Understanding 10G line card oversubscription

[Mack McBride]

The connection of the port pairs on the 6708 is limited to 16GB each direction to the fabric asic.
On the 6716 the groups are four ports which share a connection of 10GB each direction to the fabric asic.

Mack

-----Original Message-----
From: John Neiberger [mailto:jneiberger at gmail.com] 
Sent: Tuesday, March 22, 2011 10:56 AM
To: Mack McBride
Cc: Sergey Nikitin; D B; cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Understanding 10G line card oversubscription

I was under the impression that the total bandwidth available per
four-port group was 40G, so the limiting factor on the 6708 was
backplane connectivity (2x20G), but perhaps that has more to do with
multicast replication capacity. What is this 16G limit you're
referring to?

John

On Tue, Mar 22, 2011 at 10:28 AM, Mack McBride <mack.mcbride at viawest.com> wrote:
> I had forgotten about that break out session but it does correspond with what I thought.
> The over-subscription per four port group is 10G on the 6716 as opposed to 16G on the 6708.
>
> Mack
>
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Sergey Nikitin
> Sent: Tuesday, March 22, 2011 1:17 AM
> To: D B
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Understanding 10G line card oversubscription
>
> Try to look at this:
>
> http://depositfiles.com/ru/files/j2b46xu52
>
> or google BRKARC-3465, page 33/34.
>
> D B wrote:
>> I'm looking for in-depth documentation on switch fabric oversubscription for
>> these two 10G line cards:
>> WS-X6708-10GE
>> WS-X6716-10GE
>>
>> I'd like to understand its design and operation regarding these cards. Also,
>> how to identify/quantify instances where oversubscription is nearing/hitting
>> thresholds that will cause packet drops (SNMP?).
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